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Since the 3D-printed check stones slide eiter to easy or even break apart we adapted it by using round magnets with glued in washers.
The haptic feeling was good regarding the magnets, but some issues remain at the moment: The 3D printed Braille is not fingertip-friendly, here might be a blank card and using common embossed Braille sticker better. Furthermore, the magnets tend to flip to easy to the neighbouring magnet, and for the abacus the washer didn't gave optimal locks at one number. For this issues deeper holes will work in the next version.
Design files for OpenScad can be found here.
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